EP1142209B1 - Procede et systeme pour transmettre des donnees dans une automobile - Google Patents

Procede et systeme pour transmettre des donnees dans une automobile Download PDF

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Publication number
EP1142209B1
EP1142209B1 EP99966806A EP99966806A EP1142209B1 EP 1142209 B1 EP1142209 B1 EP 1142209B1 EP 99966806 A EP99966806 A EP 99966806A EP 99966806 A EP99966806 A EP 99966806A EP 1142209 B1 EP1142209 B1 EP 1142209B1
Authority
EP
European Patent Office
Prior art keywords
station
current
central station
data transmission
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99966806A
Other languages
German (de)
English (en)
Other versions
EP1142209A2 (fr
Inventor
Stefan Hermann
Ekkehart-Peter Wagner
Marten Swart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1142209A2 publication Critical patent/EP1142209A2/fr
Application granted granted Critical
Publication of EP1142209B1 publication Critical patent/EP1142209B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/028—Arrangements specific to the transmitter end
    • H04L25/0282—Provision for current-mode coupling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0292—Arrangements specific to the receiver end
    • H04L25/0294—Provision for current-mode coupling

Definitions

  • the invention relates to a method and a system for transmission of data between a satellite station and one Central station in a motor vehicle.
  • a data transmission system of this type is known from EP-A-0 522 244.
  • satellite stations In occupant protection systems in motor vehicles, such as airbag systems or belt tensioner systems, are additional in some cases to a central station effecting an impact detection one or more satellite stations are provided which e.g. are arranged in side areas of the motor vehicle and cause impact detection or early accident detection there. Such satellite stations transmit on detection an impact or risk of accident data to the central station, so that they control suitable triggering measures can.
  • the satellite station can also be designed so that they send messages (signs of life) at regular intervals Central station transmits.
  • the quiescent current of the satellite station corresponds to one Zero level (low level) and the sum of quiescent current and pulse current a positive level (high level). Because of a Band limitation that is used to reduce noise and other The superimposed current impulses have to suppress interference effects not an exact rectangular shape, but have flanks finite steepness. So the pulse width is the with the help of the comparator recovered data signal from the location of the Reference value dependent.
  • the reference value which is the switching threshold between a low level and a high level, to be specified as a fixed value. Because the quiescent current is one Satellite station but depending on manufacturing tolerances and fluctuates greatly from the operating state a fixed reference value inevitably leads to fluctuations in the pulse width of the transmitted signals and thus possibly incorrect data transmission.
  • the invention is based on the technical problem fluctuating quiescent current of a satellite station a reliable Data transmission between the satellite station and one To ensure central station in a motor vehicle.
  • this problem is solved by a method the features of claim 1 and by a data transmission system solved according to claim 7.
  • Advantageous further training the invention are laid down in the subclaims.
  • the reference value is the sum of a controllable Base portion and a predetermined impulse portion formed.
  • quiescent current phases i.e. in phases in which none
  • the basic share is transferred with the help of a data Control circuit tracked the current quiescent current value.
  • the position of the reference value remains relative to the quiescent current value always constant, so that the pulse width of the recovered Data signal no longer depends on the current quiescent current and thus guarantees an error-free data transfer is.
  • a central station 1 is via a data transmission line 2 connected to a satellite station 3.
  • the central station 1 and the satellite station 3 form, if necessary together with other satellite stations, a data transmission system in a motor vehicle and preferably control an occupant protection system, e.g. an airbag system or a Belt tensioner system.
  • the necessary for this in the central station 1 Components such as microprocessor, memory or output interfaces are known and not shown in Figure 1.
  • a constant voltage source 4 arranged through which the satellite station 3 via the data transmission line 2 regardless of the power consumption supplied with a continuous quiescent voltage becomes.
  • Components not shown, such as sensors or microprocessors, available are also known in the satellite station 3 a voltage regulator 5 is provided on the input side is connected to the data transmission line 2 and on the output side the supply voltage (e.g. 5 V) for the Components of the satellite station 3 generated in a controlled manner.
  • a current generator 6 connected in parallel to the voltage regulator 5 and a controllable switch 7, which is controlled in accordance with the data to be sent by a control circuit (not shown)
  • current pulses with a predetermined pulse current strength I IMP are generated.
  • the data information is encoded over the pulse duration.
  • the current pulses are then simply superimposed on the quiescent current of the satellite station 3 flowing over the data transmission line 2.
  • a measuring resistor 10 is arranged in the central station 1 between the voltage source 4 and the data transmission line 2.
  • the signal voltage U SIG falling thereon which is proportional to the signal current I SIG flowing through the data transmission line 2, is fed via an amplifier 11 to a first comparator 12 and compared by this with a reference voltage U REF .
  • the reference voltage U REF is formed as the sum of a controllable base voltage reference value U 0_REF and a predetermined pulse voltage reference value U IMP_REF .
  • the pulse voltage reference value U IMP_REF is preferably set so that it corresponds to a voltage level which is caused at the output of the amplifier 11 by a current pulse with half the pulse current.
  • the signal voltage U SIG is less than the reference voltage U REF , this indicates that no data is currently being transmitted and thus only the quiescent current I 0 flows via the data transmission line 2. In this case, a low level is present at the output of the first comparator 12.
  • the signal voltage U SIG then corresponds to a voltage level which is caused solely by the current quiescent current I 0 .
  • the base voltage reference value U 0_REF is present in such quiescent current phases, that is to say as long as there is a low level at the output of the first comparator 12 the signal voltage U SIG tracked.
  • the signal voltage U SIG is compared with the base voltage reference value U 0_REF using a second comparator 20.
  • a digital counter 22 is controlled via a logic unit 21, by means of which the base voltage reference value U 0_REF is increased or decreased to the value of the signal voltage U SIG .
  • the control speed is controlled via an internal clock frequency f CLOCK .
  • the output signal of the counter is converted into the analog base voltage reference value U 0_REF via a D / A converter 23.
  • the base voltage reference value U 0_REF is adapted to the current quiescent current I 0 of the satellite station 3. This ensures that the position of the voltage reference value U REF always remains relative to a caused by the quiescent current I 0 base voltage U 0 constant, so that an error-free implementation is ensured of the current signal in the original pulse sequence by the first comparator 12, and thus a reliable data transmission ,

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Radio Relay Systems (AREA)

Claims (9)

  1. Procédé pour transmettre des données entre une station centrale (1) disposée dans un véhicule à moteur et une station (3) placée dans le véhicule à un endroit éloigné de la station centrale et étant reliée à la station centrale (1) par une ligne de transmission de données, dans lequel
    la station (3) est alimentée par la ligne de transmission de données (2) avec une tension continue de repos,
    les données sont transmises sous forme d'impulsions de courant ayant une intensité préétablie, superposées à un courant de repos de la station (3),
    le signal des données est démodulé dans la station centrale (1) à l'aide d'un premier comparateur (12) qui compare la valeur de l'intensité du courant d'arrivée avec une valeur de référence,
       caractérisé en ce que
    la valeur de référence est formée par la somme d'une composante de base et d'une composante d'impulsion prédéterminée, et
    la composante de base est adaptée par un circuit de réglage (13) à la valeur actuelle du courant de repos dans des phases de courant de repos.
  2. Procédé selon la revendication 1, caractérisé en ce que la composante d'impulsion correspond à la moitié de l'intensité du courant d'impulsion.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la vitesse de réglage du circuit de réglage (13) est commandée par une fréquence de cycles.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le circuit de réglage (13) est mis hors service pendant les phases dans lesquelles des données sont transmises depuis la station centrale (1) à la station (3).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la composante de base est augmentée par le circuit de réglage (13) dans les phases d'impulsion.
  6. Procédé selon l'une des revendications 3 ou 4, caractérisé en ce que la fréquence des cycles est diminuée dans les phases d'impulsion.
  7. Système de transmission de données pour la transmission de données entre une station centrale (1) disposée dans un véhicule à moteur et une station (3) placée dans le véhicule à un endroit éloigné de la station centrale, comportant
    une ligne de transmission de données (2) reliant la station centrale (1) et la station (3),
    une source de voltage constant (4) dans la station centrale (1) pour alimenter la station (3) en courant,
    un générateur de courant (6) et un commutateur à commande (7) dans la station (3) pour générer des impulsions représentant des données à transmettre et ayant une intensité d'impulsion prédéterminée, ces impulsions étant superposées à un courant de repos de la station (3),
    un premier comparateur (12) dans la station centrale (1) pour comparer le courant de signaux circulant sur la ligne de transmission de données (2), avec une valeur de référence préétablie,
       caractérisé en ce
    que la valeur de référence est formée par la somme d'une composante de base et d'une composante d'impulsion prédéterminée, et
    qu'un circuit de réglage (13) est disposé dans la station centrale (1) pour adapter dans des phases de courant de repos la composante de base à la valeur actuelle du courant de repos.
  8. Système de transmission de données selon la revendication 7, caractérisé en ce que le courant de signal est récupéré à l'aide d'une résistance de mesure (10).
  9. Système de transmission de données selon l'une des revendications 7 ou 8, caractérisé en ce que le circuit de réglage (13) comprend
    un second comparateur (20) pour comparer la composante de base avec le courant de signal,
    un compteur numérique (22) pour augmenter ou diminuer la composante de base,
    une unité de logique (21) commandant le compteur (22) en fonction des signaux de sortie du premier comparateur (12) et du second comparateur (20), et
    un convertisseur numérique-analogique (23) pour convertir le signal de sortie du compteur (22) en composante de base.
EP99966806A 1998-12-21 1999-12-01 Procede et systeme pour transmettre des donnees dans une automobile Expired - Lifetime EP1142209B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19859178 1998-12-21
DE19859178A DE19859178C1 (de) 1998-12-21 1998-12-21 Verfahren und System zum Übertragen von Daten in einem Kraftfahrzeug
PCT/DE1999/003809 WO2000038372A2 (fr) 1998-12-21 1999-12-01 Procede et systeme pour transmettre des donnees dans une automobile

Publications (2)

Publication Number Publication Date
EP1142209A2 EP1142209A2 (fr) 2001-10-10
EP1142209B1 true EP1142209B1 (fr) 2003-10-22

Family

ID=7892065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99966806A Expired - Lifetime EP1142209B1 (fr) 1998-12-21 1999-12-01 Procede et systeme pour transmettre des donnees dans une automobile

Country Status (3)

Country Link
EP (1) EP1142209B1 (fr)
DE (2) DE19859178C1 (fr)
WO (1) WO2000038372A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6760380B1 (en) 1998-12-07 2004-07-06 Lynk Labs, Inc. Data transmission apparatus and method
CN1466836A (zh) * 2000-07-27 2004-01-07 莱恩克实验股份有限公司 数据传输设备和方法
GB0519361D0 (en) * 2005-09-22 2005-11-02 Ami Semiconductor Belgium Bvba Data transmission over power supply line
US8307227B2 (en) 2006-11-08 2012-11-06 Freescale Semiconductor, Inc. Data communication system and method
DE102008002292B4 (de) 2008-06-09 2023-10-19 Robert Bosch Gmbh Steuergerät und Steuerverfahren
DE102008041030A1 (de) 2008-08-06 2010-02-11 Robert Bosch Gmbh Vorrichtung und Verfahren zur Erfassung einer Messgröße
DE102021133780A1 (de) 2021-12-20 2023-06-22 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Vorrichtung und Verfahren zum infrastrukturseitigen Verbinden und Trennen von Kontakten für eine Wechselstromverbindung zwischen einer Ladeinfrastruktur und einem zu ladenden Fahrzeug

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518858A1 (fr) * 1981-12-23 1983-06-24 Jeumont Schneider Dispositif de transmission de signaux sur une ligne assurant egalement une alimentation en tension continue
JP3021803B2 (ja) * 1991-05-30 2000-03-15 富士電機株式会社 信号伝送方法
DE4201468A1 (de) * 1992-01-21 1992-07-23 Daimler Benz Ag Bussystem mit integrierter spannungsversorgung fuer teilnehmer des systems
DE19733866C2 (de) * 1997-08-05 2002-09-12 Siemens Ag System zur Übertragung von Daten in einem Kraftfahrzeug

Also Published As

Publication number Publication date
DE59907482D1 (de) 2003-11-27
DE19859178C1 (de) 2000-05-25
WO2000038372A2 (fr) 2000-06-29
WO2000038372A3 (fr) 2000-10-26
EP1142209A2 (fr) 2001-10-10

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